first place,
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,” Zavadil says. The goal is to produce a working prototype of the new battery — one that can last through thousands of cycles — by the end of 2017.
At the University of Texas at Austin, materials engineer Guihua Yu,
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, along with colleagues at Zhejiang University of Technology in Hangzhou,
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, China, is investigating another work-around for this battery type: replacing the solid sulfur cathode with an intricate structure that encapsulates the sulfur in an array of nanotubes. Reported in the November issue of Nano Letters, the nanotubes that encase the sulfur are fashioned from manganese dioxide, a material that can attract and hold on to polysulfides. The nanotubes are coated with polypyrrole, a conductive polymer that helps boost the flow of electrons.
This approach reduces buildup and boosts overall conductivity and efficiency, Yu says. So far,
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, with the group’s new architecture,
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, the battery loses less than 0.07 percent of its capacity per charge and discharge cycle. After 500 cycles, the battery maintained about 65 percent of its original capacity,
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, a great improvement over the short lifetime of current lithium-sulfur batteries. Still, for use in electric vehicles, scientists want batteries that can last through thousands of cycles,
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, or 10 to 15 years.

Battery: Magnesium-ion


How it works: Similar to lithium-ion batteries,
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, but magnesium ions do the work


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